- Aan electric field.
- Ban induced emf.
- Ca magnetic field.
- Da magnetic dipole.
Explanation:
A charging electric field gives rise to a magnetic field.
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A photon of wavelength 6630 Å is incident on a totally reflecting surface. The momentum delivered by the photon is equal to
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(a) 6.63 × 10–27 kg-m/sec |
(b) 2 × 10–27 kg-m/sec |
(c) 10–27 kg-m/sec |
(d) None of these |
Assertion : Leclanche cell is used, when constant supply of electric current is not required.
Reason : The e.m.f. of a Leclanche cell falls, if it is used continuously.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
In a hydrogen atom, which of the following electronic transitions would involve the maximum energy change
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(a) From n = 2 to n = 1 |
(b) From n = 3 to n = 1 |
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(c) From n = 4 to n = 2 |
(d) From n = 3 to n = 2 |
If 4
energy is required to move a charge of 0.25 coulomb between two points. Then what will be the potential difference between them
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(a) 178 V |
(b) 256 V |
(c) 356 V |
(d) None of these |
In transformer, core is made of soft iron to reduce
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(a) Hysteresis losses |
(b) Eddy current losses |
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(c) Force opposing electric current |
(d) None of the above |
A battery of e.m.f. 10 V is connected to resistance as shown in figure. The potential difference between the points A and B is
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(a) -2V |
(b) 2V |
(c) 5V |
(d) |